Manufacture of compound wire



(No Model.)

I. A. 82 M. D. KILMER.

MANUFACTURE OF COMPOUND WIRE. No. 309,468. Patented Dec. 16, 1884.

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IRVING A. KILMER AND MELVIN D. KILM'ER, OF SOHENEC"ADY, NEAV YORK.

MANUFACTURE OF COMPOUND WIRE.

SPECIFICATION forming part of Letters Patent No. 309,468, dated December16, 1884.

Application filed May 17, 1331.

$0 at 20720721, it may concern:

Be it known that we, InviNd A. Kristian and MELvrN D. Klmrnn, citizensof the United States, residing at Schenectady, in the county ofSchenectady and State of Xew York, have invented certain new and usefulImprovements in Process of Making Compound \Virc for Telegraphic -andother Purposes; and we do declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledinthe art to which it appertains to make and use the same, reference beinghad to the accompanying drawings, and to letters or figures of referencemarked there on, which form a part of this specification.

Figure 1 of the drawings is a representation of this invention, andshows a vertical section taken through the draw-plate, and a portion ofthe wire. Fig. 2 is a cross-section through the outer covering for thewire before being drawn. Fig. 3 is a section taken lengthwise of thewire-covcring, and shows the core ad justcd for being drawn with it.Fig. iis a .front view of the draw-plate.

This invention has relation to telegraphic and othei wires for purposesconnected with the application of electricity.

The invention consists in the novel method or process of, first, forminga U-shaped blank of soft steel or iron; secondly, introducing a copperwire longitu dinall yin the hollow thereof and drawing both through atapering die to close the steel oriron upon the copper core; and,thirdly, drawing the compound wire thus formed down to any sizerequired, all as hereinafter set forth, and pointed out in the appendedclaim.

In carrying out this invention a strip or ribbon of soft steel or iron,(Swedish iron being preferred,) to the length of several hundred feet,is rolled in U-shaped form in cross: section. A coil of copper wire ofsufficient length for the purpose hereinafter described is alsoprovided.

1) represents a draw-plate, which is made of steel, chilled iron, agate,or other sufficient ly hard substance. In this plate are formed thedie-apertures or draw-holes E F G, which are somewhat conical ortapering in form from the entrance A to the discharge B. The drawholesvary in diameter in a graduated manner.

(No model.)

The U-shaped strip-blank S is coiled upon a reel, which is located infront of the drawplate, and the coil of copper wire 0 is placed upon asecond reel above the strip-blank; or, said copper wire may be conductedby guides above the strip-blank in proper position to be introduced intothe channel thereof. The end of the strip-blank is rolled in taperingform, as indicated at Y, so that it will extend through the draw-holc Eof the plate. The end of the copper wire is introduced into thecoueshaped recess in the end of the stripblank, and is centered thereinby the form of said recess. The projecting portion of the i tapered endof the stripblank having been seized by the pinchers of the drawing-machine, the blank closes upon the end of the copper wire, grasping itfirmly as soon as the drawing operation commences. The drawing beingcontinued, the U-shapcd blank is continuously closed upon the copperwire, which is fed into the channel thereof and forms the core of thecompound wi re which is thus made. By the action of the draw-plate theedges of the U-shaped blank are solidly joined, and said blank iscentrically pressed in solid contact with the copper-wire core. Thisfirst drawing usually reduces a little the thickness of the strip-blankas well as the diameter of the wire. 13y passing the compound wire thusformed through the next smaller draw-hole of the draw-plate the diameterof the compound wire will be further reduced, and by the action of stillsmaller draw-holes the size of compound wire may be reduced according torequirement. in each reduction the thickness of the outer wall of steelor iron is reduced, as well as the diameter of the copper core. No heatis employed in the drawing.

the

V When the compound wire is reduced to the IOO \Ve are aware that it isnot new in the manufacture of wire to place a copper wire in a U- shapedstrip of iron or steel and draw the same through a die, so as to havethe said iron or steel envelop the wire 5 and while we have describedthe complete process of manufacturing wire, it will be understood thatthe novelty relied upon is in the peculiar manner of preparing the stockfor the production of wire, as specifically hereinafter pointed out.

Having described this invention, what we claim, and desire to secure byLetters Patent,

In the manufacture of wire substantially as described, the process ofpreparing the stock therefor, which consists, first, in forming aUshaped blank 01' soft steel or iron; second,

in rolling one end of the blank thus iorinedto a taper with an innercone-shaped recess; and, third, in introducing one end of a copper wire20 into the said recess for the subsequent operation of drawing, as setforth.

In testimony whereof we a'llix our signatures in presence of twowitnesses.

IRVING- A. KILMEIR. MELVIN D. KILMER.

\Vitnesses:

Breanne l ULLlZl't, 1D. I. TRUAX.

